What happens if you don't return a value in C++?

Question

Yesterday, I found myself writing code like this:

SomeStruct getSomeStruct()
{
    SomeStruct input;

    cin >> input.x;
    cin >> input.y;
}
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Answer 1

You didn't get any warning because you didn't have -Wall -Werror turned on. (As stated in other answers)

However I think you probably got a zero-filled struct as the result because the stack object was default constructed in the caller function, possibly with explicit zero arguments, or else due to zeros on the stack?